Variable Interest Entities (Change in Level 3 Assets and Liabilities) (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Transfers from Level 1 to Level 2, Assets		$ 0		$ 0		$ 0
Transfers from Level 2 to Level 1, Assets		0		0		0
Transfers from Level 1 to Level 2, Liabilities		0		0		0
Transfers from Level 2 to Level 1, Liabilities		0		0		0
Consolidated investment entities [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Transfers from Level 1 to Level 2, Assets		0		0		0
Transfers from Level 2 to Level 1, Assets		0		0		0
Transfers from Level 1 to Level 2, Liabilities		0		0		0
Transfers from Level 2 to Level 1, Liabilities		0		0		0
Corporate debt securities [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		0		2		3
Total gains (losses) included in net income	[1]			1
Purchases				2		1
Sales				(9)		(1)
Settlements						(1)
Transfers into Level 3				10
Transfers out of Level 3				(6)
Balance, at the end of the period				0		2
Common stocks [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		7		14		14
Total gains (losses) included in net income		(1)	[2]	1	[1]	1	[3]
Sales				(2)		(3)
Transfers into Level 3		7		13		21
Transfers out of Level 3		(10)		(19)		(19)
Balance, at the end of the period		3		7		14
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[3]					(2)
Syndicated loans [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		484		368		202	[3]
Total gains (losses) included in net income		(24)	[2]	2	[1]	(1)	[3]
Purchases		303		417		417
Sales		(36)		(42)		(63)
Settlements		(161)		(100)		(51)
Transfers into Level 3		776		551		320
Transfers out of Level 3		(813)		(712)		(456)
Balance, at the end of the period		529		484		368
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period		(19)	[2]	(3)	[1]	(2)	[3]
Other assets [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		1,935		1,936		1,214
Total gains (losses) included in net income		170	[4]	421	[5]	81	[6]
Total gains (losses) included in other comprehensive income (loss)		(154)		(175)		39
Purchases		638		289		689
Sales		(524)		(547)		(86)
Transfers into Level 3				11		8
Transfers out of Level 3						(9)
Balance, at the end of the period		2,065		1,935		1,936
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period		20	[4]	362	[5]	67	[6]
Debt [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Balance, at the beginning of the period		(6,030)		(4,804)		(4,450)
Total gains (losses) included in net income		215	[2]	(34)	[1]	(53)	[3]
Issues		(1,267)		(1,670)		(1,330)
Settlements		452		478		1,029
Balance, at the end of the period		(6,630)		(6,030)		(4,804)
Changes in unrealized gains/ (losses) included in income relating to liabilities held at end of period		$ 219	[2]	$ 1	[1]	$ (25)	[3]

[1] Included in net investment income in the Consolidated Statements of Operations.

[2] Included in net investment income in the Consolidated Statements of Operations.

[3] Included in net investment income in the Consolidated Statements of Operations.

[4] Included in other revenues in the Consolidated Statements of Operations

[5] Included in other revenues in the Consolidated Statements of Operations

[6] Included in other revenues in the Consolidated Statements of Operations.